Yb^(3+)-Er^(3+)掺杂溴化铯铅钙钛矿纳米晶的上转换发光

Upconverting Perovskite Nanostructures of Yb-Er Doped Cesium Lead Bromide

采用热注入法制备了Yb^(3+)-Er^(3+)共掺溴化铯铅钙钛矿纳米晶体。通过控制前驱体注入温度以及溶剂和络合剂之间的比例,可以对纳米晶体的形貌进行调控,例如,反应生成量子点、纳米立方体、纳米花、纳米棒、纳米带和纳米片。通过透射电子显微镜、X射线衍射、荧光光谱等测试手段对其晶体结构以及发光性能进行了表征。实验结果表明,在近红外光激光激发下,Yb^(3+)-Er^(3+)共掺溴化铯铅钙钛矿纳米晶中可观察到来自Er离子的绿光(540 nm)和红光(646 nm)发射。对于不同形貌的Yb^(3+)-Er^(3+)共掺溴化铯铅钙钛矿纳米晶体,在近红外光激发下均观察到Yb^(3+)离子敏化Er^(3+)离子发光现象,这是由于存在Yb^(3+)→Er^(3+)的能量转移。对钙钛矿材料进行稀土掺杂实现了在近红外光激发下的上转换发光现象,这有利于钙钛矿家族材料在生物医学方面的应用。

Yb^(3+)-Er^(3+)co-doped all inorganic cesium lead bromide perovskite nanocrystals were prepared by hot injection method.The photoluminescence properties and crystal structure were characterized by transmission electron microscopic,fluorescence spectrum and X-ray diffraction.The experimental results show that Yb^(3+)-Er^(3+)co-doped all inorganic perovskite nanocrystals emit bright green light(540 nm)and red light(646 nm)under the excitation of near-infrared light.In addition,it was found in the experimental process that the morphologies tuning of the Yb^(3+)-Er^(3+)co-doped perovskite bromide nanostructures i.e.quantum dots,nanotubes,nanorods,nanoflowers,nanobelts,nanosheets have been successfully achieved by controlling reaction temperature,the temperature injected by the precursor and the proportion of the complexing agent and solvent.For Yb^(3+)-Er^(3+)co-doped perovskite nanocrystals with different morphology,the phenomenon of Yb^(3+)sensitization Er^(3+)luminescence was observed under the excitation of near-infrared light,which is due to the existence of Yb^(3+)-Er^(3+)energy transfer.Rare earth doping of perovskite materials can realize the up-conversion luminescence phenomenon under the excitation of near-infrared light,which is beneficial to the application of perovskite family materials in biomedical field.